gecko/dom/apps/FreeSpaceWatcher.jsm
Birunthan Mohanathas f882bf3044 Bug 1058101 - Flatten dom/apps/src/ into parent directory. r=mccr8
--HG--
rename : dom/apps/src/AppDownloadManager.jsm => dom/apps/AppDownloadManager.jsm
rename : dom/apps/src/AppsService.js => dom/apps/AppsService.js
rename : dom/apps/src/AppsService.manifest => dom/apps/AppsService.manifest
rename : dom/apps/src/AppsServiceChild.jsm => dom/apps/AppsServiceChild.jsm
rename : dom/apps/src/AppsUtils.jsm => dom/apps/AppsUtils.jsm
rename : dom/apps/src/FreeSpaceWatcher.jsm => dom/apps/FreeSpaceWatcher.jsm
rename : dom/apps/src/InterAppComm.cpp => dom/apps/InterAppComm.cpp
rename : dom/apps/src/InterAppComm.h => dom/apps/InterAppComm.h
rename : dom/apps/src/InterAppComm.manifest => dom/apps/InterAppComm.manifest
rename : dom/apps/src/InterAppCommService.js => dom/apps/InterAppCommService.js
rename : dom/apps/src/InterAppCommService.jsm => dom/apps/InterAppCommService.jsm
rename : dom/apps/src/InterAppConnection.js => dom/apps/InterAppConnection.js
rename : dom/apps/src/InterAppMessagePort.js => dom/apps/InterAppMessagePort.js
rename : dom/apps/src/OfflineCacheInstaller.jsm => dom/apps/OfflineCacheInstaller.jsm
rename : dom/apps/src/OperatorApps.jsm => dom/apps/OperatorApps.jsm
rename : dom/apps/src/PermissionsInstaller.jsm => dom/apps/PermissionsInstaller.jsm
rename : dom/apps/src/PermissionsTable.jsm => dom/apps/PermissionsTable.jsm
rename : dom/apps/src/ScriptPreloader.jsm => dom/apps/ScriptPreloader.jsm
rename : dom/apps/src/StoreTrustAnchor.jsm => dom/apps/StoreTrustAnchor.jsm
rename : dom/apps/src/Webapps.js => dom/apps/Webapps.js
rename : dom/apps/src/Webapps.jsm => dom/apps/Webapps.jsm
rename : dom/apps/src/Webapps.manifest => dom/apps/Webapps.manifest
2014-08-27 10:12:06 -07:00

119 lines
4.1 KiB
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/FileUtils.jsm");
this.EXPORTED_SYMBOLS = ["FreeSpaceWatcher"];
function debug(aMsg) {
//dump("-*-*- FreeSpaceWatcher.jsm : " + aMsg + "\n");
}
// Polling delay for free space, in ms.
const DEFAULT_WATCHER_DELAY = 1000;
this.FreeSpaceWatcher = {
timers: {},
id: 0,
/**
* This function will call aOnStatusChange
* each time the free space for apps crosses aThreshold, checking
* every aDelay milliseconds, or every second by default.
* aOnStatusChange is called with either "free" or "full" and will
* always be called at least one to get the initial status.
* @param aThreshold The amount of space in bytes to watch for.
* @param aOnStatusChange The function called when the state changes.
* @param aDelay How often (in ms) we check free space. Defaults
* to DEFAULT_WATCHER_DELAY.
* @return An opaque value to use with stop().
*/
create: function spaceWatcher_create(aThreshold, aOnStatusChange, aDelay) {
let timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
debug("Creating new FreeSpaceWatcher");
let callback = {
currentStatus: null,
notify: function(aTimer) {
try {
let checkFreeSpace = function (freeBytes) {
debug("Free bytes: " + freeBytes);
let newStatus = freeBytes > aThreshold;
if (newStatus != callback.currentStatus) {
debug("New status: " + (newStatus ? "free" : "full"));
aOnStatusChange(newStatus ? "free" : "full");
callback.currentStatus = newStatus;
}
};
let navigator = Services.wm.getMostRecentWindow("navigator:browser")
.navigator;
let deviceStorage = null;
if (navigator.getDeviceStorage) {
deviceStorage = navigator.getDeviceStorage("apps");
}
if (deviceStorage) {
let req = deviceStorage.freeSpace();
req.onsuccess = req.onerror = function statResult(e) {
if (!e.target.result) {
return;
}
let freeBytes = e.target.result;
checkFreeSpace(freeBytes);
}
} else {
// deviceStorage isn't available, so use the webappsDir instead.
// This needs to be moved from a hardcoded string to DIRECTORY_NAME
// in AppsUtils. See bug 852685.
let dir = FileUtils.getDir("webappsDir", ["webapps"], true, true);
let freeBytes;
try {
freeBytes = dir.diskSpaceAvailable;
} catch(e) {
// If disk space information isn't available, we should assume
// that there is enough free space, and that we'll fail when
// we actually run out of disk space.
callback.currentStatus = true;
}
if (freeBytes) {
// We have disk space information. Call this here so that
// any exceptions are caught in the outer catch block.
checkFreeSpace(freeBytes);
}
}
} catch(e) {
// If the aOnStatusChange callback has errored we'll end up here.
debug(e);
}
}
}
timer.initWithCallback(callback, aDelay || DEFAULT_WATCHER_DELAY,
Ci.nsITimer.TYPE_REPEATING_SLACK);
let id = "timer-" + this.id++;
this.timers[id] = timer;
return id;
},
/**
* This function stops a running watcher.
* @param aId The opaque timer id returned by create().
*/
stop: function spaceWatcher_stop(aId) {
if (this.timers[aId]) {
this.timers[aId].cancel();
delete this.timers[aId];
}
}
}